Lifting-jack



G. C. CONDITO.

LIFTING JACK.

APPLICATION FILED JAN. 14, 1919.

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15/ I I II 3 9 i mum/r09 G. c. CONDITO.

LIFTING JACK.

APPLICATION FILED JAN.14| 1919.

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A TTORNEY Patented June 29, 1920;

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UNITED STATES,"

PATENT orrice. A

cnonen c. co1vnr'ro,'or WINGDALE, NEW YORK.

LIETING-JACK.

To all whom it may concern: a

Be it known that I, GEORGE C. CoNDrro, a citizen of the; United States,residing at Wingdale, in the county of Dutchess and Stateof New Yorkhave invented. new and useful Improvements in Lifting-Jacks, of whichthe following is a specification.

This invention relates to new and useful improvements in lifting jacks,and pertains more particularly to lifting jacks .of the screwtype whichare adapted tobe-hand The primary object of the invention is to providea hand operated lifting ack in which means is providedto operate thesame in either direction to raise and .lowerthe lifting "element at thewill of the operator.

A further object of the invention s tto provide means .for locking. theactuatlng mechanism in either of its operative positions. V v v c Afurther object of the invention is 'to provide a. device of thischaracter which is both simpleand cheap in construction, and of easyoperation lViththe above and other objects in view which will appear asthe description of the case proceeds, reference is had to jtheaccompanying drawings in which Figurel isa top planvlew ofaqackconstructed in accordance with the present in vention, H. F ig. 2 isaside elevation thereof.

Fig. 8 is .a longitudinal 'SBCtlOIlitl view through the jack.

Fig. 4 isa detail View of 0a of the 11am};

elements. a

.Fig. 5 is a sectional view on the line 55 ofFig. 1'.

Flg. 61s a fragmentary v1ew actuating means.

Fig. 7 is a detail sectional view on the line Fig." 8 is. a detail viewtop plan' of the pawl engaging disk. I ,1 i I Fig. 9 is atransversesection through ,the pawl engaging disk. Fig. 10 isa detail View of.retaining inutfor thepawl engaging disk, Fig. 11 is a -detail viewingelevation of that portion of the jack shOW-n in Fig. 10, and

- Fig. 12 is a detail viewof the operating mechanism locking meansReferring more P ticularly to the draw the slot 14 the partly in sectionof the spider member. and the pawlv the lifting element 20 isroughened'or ser- Vment 20 and the nut 23.

Specification of Letters Patent. P t t d J 29, 19 0 Application filedJanuary 14, 1919. Serial No. 271,072.

provided with an enlarged base 11.

This pedestal member 10 is substantially hollow, and has its upper endreduced as at 12,.said reduced end being provided with an internal screwthread 13. The pedestal 1.0 is also provided with a cut out portion orslot 14, the purposeof which will be hereinafter described, and near itsupper fendat a pointsubstantially diametrically opposite pedestal 10 isprovided with ahandle 15.. V

.Having screw threaded engagement with the internal screw thread of thepedestal 10 and 1 movable longitudinally thereof is .a screw threadedstandard 16, the thread of said standard being designated by the numeral17. Thescrew thread 17 terminates at a point remote from the lower endof the standard 16 to provide a smooth bearing 1 18, is a liftingelement 20- which projects through the slot 14,. and on its under face,and concentric with the jopening 21 in which the smooth bearin-gsurface18 operates, this lifting element is provided with a! "ball race22, i

Threaded on the screwthreade'd end 19 of the standard 16 is a nut 23which is shown in F igs 3, 10 and 11, and is provided on its upper face24 withaconcentric ball-race 25. This nut 23 is also provided witha-transversely extending opening26 which isscrew threaded as at 27 forthe reception of a transversely extending locking pin or-bolt 28 whichserves to secure the nut 23against accidental displacement. The upperfaceof rated as shown at 29, and on its under face it isprovided with anintegral lugor the like 30. 'Mountedbetween the'lifting .ele-

ment 20 and the nut 23inthe ball races 22 r and 25 are balls 31 whichserve to form an antirfriction joint between the lifting ele- Moui1tedon the upper end of the standard 33, and .mountedbetween the upper endof these two members, and said shoe 32 is re- ;16: is a shoe. or thelike 32, the upper face of I which is roughened orserrated as shown attained on the upper end of the standard 16 by means of the screw 35'Near 1ts upper end,'the screw threaded standard 16 is provided with anannular collar 36 above which the standard 16 is squared as at 37, andmounted on the collar of a plate 42 secured in place by bolts '43.

Mounted for rotation abont the standard 16 and resting on the upper faceof the disk 39 is a spider or similar member -44 which is provided'witha plurality of perforations 45 so spacedas to be adapted for movementinto'regi'ster with the perforations 41 in the disk 39, and mounted forvertical sliding movement within these perforations 45 are pawls 46which are provided on their u' 'pe'r end with an off-set portion 47. Theper orations'45 "are provided with extensions 48 for the reception ofthe off-set portion of said pawls. These pawls 46 are provided on theirlower endswith inclined faces 49, and

I "said pawls are arranged in sets with the incllned facesof one setdisposed in one direction, and those of the other set arranged in theopposite "direction.-

The spider member 44 is 'cut out as to form an annular channel 50ammounted, 'for rotation 1n said channel is a ring 51 which is providedthroughout a portion of its periphery witha head 52 adapted to'bereceived'within an annular passage 53in the upper surface of the spidermember.

The spider member 44'also is provided with a hollow extension 54 whichis adapted to receive an operating handle 55 shown in dotted lines inFig. '8. Pivotally mounted "on the top of said hollow extension is alever '56, provided on one end with a handle 57.

The innerend of this lever 56 is adapted to engage in a recess in thering 51 sothat when the lever is rocked the ring 51 is rotated in theannular channel of the spider me'mber44. This ring '51 is provided'onits under face with-cutout portions '59, one wall of which is providedwith a; projection6O which is adapted to engage the under face 'ofthehead 47 of its respective pawl, the head of the pawl being receive'd'insaid out out por ti0n59. 5 7

From the foregoing, it will be seen that if the spider member 44 isrockedabout the standard 16 in one direction, thatoneof the s'ets'ofpawls willbe lifted outof' the openings 41in the disk 39in whichthey areen-' gaged, and if the lever is actuated in the opposite direction, theother set of pawls will be likewise operated;

Asyshown in Fig. 7, the set of pawls which are disengaged from theopenings 41 are held up in their disengaged positionsby the shoulders 60formed in the recesses 59, and theseseveral shoulders are moved into andout of engagement with their respective pawls by means of the ringmember 51, which in turn is operated by the pivoted lever 56, which isheld in either of its positions by means of asprin'g pressed pin 60,which is actuated by means of the coil spring 61. This pin-60 and spring61'are mounted in a receded lng'62, and retained therein by means of thehollow screw '63. From the foregoing, it will be seen that the presentinvention provides novel means by which the screw threaded standard 16may be rotatedin either direction to raise or lower either of thelifting elements 20 and 32. V r a 4 Having thus described the invention,what is claimed is: V a f p f 1. A lifting jack comprising a pedestah'alifting screw threadedly connected with the pedestal, a disk fixed tothe screw and provide'd with an annular series of apertures,"a spidermember free to rotate on the screw above the disk and provided with setsof movable pawls adapted to co-act with the apertures in said disk torespectively revolve the screw in two directions, means adapted V torevolve upon the spider member, said means co-acting with the pawls andadapted to control their movements with respect to the apertures insaiddisk, inechanismi for actuating said means, and a shoe carried by saidscrew.

- 2. A lifting jack comprising a pedestal, a

pedestal, a disk fixed to the screw and provided with an annular seriesor apertures, a spider member free to rotate on the screw above'the diskand provided with "sets" of movable pawls ada'pted'to co-act with theapertures in said disk to respectively revolve the screw in twodirections, means adapted to revolve upon the "spider member, said meansco-actingwith'thepawls and adapted to control theirmovements withrespect to the apertures in-said disk, mechanism for 'actuati'ngsaidmeans, a shoe carried by1sa1d screw, and a locking device engageablewith the actuating mechanism, as and for the purpose described. 7 V

'3. A lifting jackcompr'isin'g a pedestal, a screw threadedly connectedwith said'pedestal, a disk fixed to thesc'rew to rotate there-- I withand provided with annular series' of apertures, a spider free to revolveonthe screw "and disposed above the disk, sets .of. pawls movablevertically in the spider and i 10 5 lifting screw threadedly connectedwith the adapted to co-act with the apertures in said disk, movablemeans concentric of the screw for respectively actuating said sets ofpawls With relation to the apertures in said disk, 5 an operatin handlecarried by the spider, mechanism or actuating the movable means,

and locking device co-acting' with said mechanism to retain adjustmentsof the movable means.

In testimony whereof I have affixed my 10 signature.

7 GEORGE C. CONDITO.

